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Full Discussion: Moving files
Top Forums UNIX for Dummies Questions & Answers Moving files Post 302400103 by achenle on Tuesday 2nd of March 2010 07:56:07 AM
Old 03-02-2010
First, you need to define exactly what you mean by "finished copying", and you need to define it precisely.

And remember you're going to have to handle error conditions, too, such as when someone is copying a file remotely and the connection drops before the copy is done.

FWIW, the only person who can tell definitively that any copy is complete is the person sending the file, because the receiver can't know what's being sent as the receiver doesn't have the original. That means if you value reliability and guaranteed correctness, you MUST have the sender somehow flag that the copy is complete. Probably the easiest way is with a rename of the file. Call it something like 'filename.part' while copying, then rename it to 'filename' once the copy is done.

No, you CAN'T reliably use something like lsof on a Linux box to check if any other process has the file open, because that ignores error conditions.
 

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LEARN ABOUT X11R4

write

WRITE(1)                                                    BSD General Commands Manual                                                   WRITE(1)

NAME

     write -- send a message to another user

SYNOPSIS

     write user [tty]

DESCRIPTION

     The write utility allows you to communicate with other users, by copying lines from your terminal to theirs.

     When you run the write command, the user you are writing to gets a message of the form:

           Message from yourname@yourhost on yourtty at hh:mm ...

     Any further lines you enter will be copied to the specified user's terminal.  If the other user wants to reply, they must run write as well.

     When you are done, type an end-of-file or interrupt character.  The other user will see the message 'EOF' indicating that the conversation is
     over.

     You can prevent people (other than the super-user) from writing to you with the mesg(1) command.

     If the user you want to write to is logged in on more than one terminal, you can specify which terminal to write to by specifying the termi-
     nal name as the second operand to the write command.  Alternatively, you can let write select one of the terminals - it will pick the one
     with the shortest idle time.  This is so that if the user is logged in at work and also dialed up from home, the message will go to the right
     place.

     The traditional protocol for writing to someone is that the string '-o', either at the end of a line or on a line by itself, means that it is
     the other person's turn to talk.  The string 'oo' means that the person believes the conversation to be over.

SEE ALSO

     mesg(1), talk(1), wall(1), who(1)

HISTORY

     A write command appeared in Version 1 AT&T UNIX.

BUGS

     The sender's LC_CTYPE setting is used to determine which characters are safe to write to a terminal, not the receiver's (which write has no
     way of knowing).

BSD                                                              February 13, 2012                                                             BSD
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